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Life's history in ironA new study examines how Earth's oldest iron formations could have been formed before oxygenic photosynthesis played a role in oxidizing iron.http://phys.org/news334569948.html
EarthFri, 07 Nov 2014 08:05:57 ESTnews334569948The rise and fall of oxygenHow long has Earth's atmosphere included oxygen? A recent paper suggests low levels of oxygen appeared in the atmosphere approximately 2.95 billion years ago. That's about 550 million years earlier than previously thought.http://phys.org/news305976284.html
EarthWed, 11 Dec 2013 09:25:02 ESTnews305976284Precious Western Australia mineral geologically 'young'Scientists at Curtin University have chronicled the genesis of a particular type of iron deposit in the state's north, finding that the valuable mineral formed relatively late in Western Australia's evolution.http://phys.org/news295079728.html
EarthWed, 07 Aug 2013 07:50:01 ESTnews295079728Iron in primeval seas rusted by bacteria(Phys.org) —Researchers from the University of Tübingen have been able to show for the first time how microorganisms contributed to the formation of the world's biggest iron ore deposits. The biggest known deposits – in South Africa and Australia – are geological formations billions of years old. They are mainly composed of iron oxides – minerals we know from the rusting process. These iron ores not only make up most of the world demand for iron – the formations also help us to better understand the evolution of the atmosphere and climate, and provide important information on the activity of microorganisms in the early history of life on Earth.http://phys.org/news286096270.html
EarthThu, 25 Apr 2013 08:11:17 ESTnews286096270Solution to ancient rock puzzle positedA superplume, or massive episode of volcanic eruptions that related to extensive melting of the Earth's mantle, could explain the puzzling reappearance of major iron formations long after the rise in atmospheric oxygen about 2.4 billion years ago, which should have prevented iron forming, according to a study published in Nature this week.http://phys.org/news254729062.html
EarthFri, 27 Apr 2012 07:30:01 ESTnews254729062Debut of chromium signatures clocks great oxidation eventBanded ironstone core samples from the Pilbara have aided in dating the first appearance of atmospheric oxygen at 2.48 billion years ago.http://phys.org/news241440768.html
EarthFri, 25 Nov 2011 11:10:01 ESTnews241440768Banded rocks reveal early Earth conditions, changes(PhysOrg.com) -- The strikingly banded rocks scattered across the upper Midwest and elsewhere throughout the world are actually ambassadors from the past, offering clues to the environment of the early Earth more than 2 billion years ago.http://phys.org/news174489840.html
EarthSun, 11 Oct 2009 14:24:50 ESTnews174489840